The 232 Series is used for Outside-of-Post to Outside-of-Post mounting to 2" metal posts. The tensioning device is a 2" long Invisiware Receiver, which installs through the metal post on one end. A Pull-Lock fitting of the same length is installed through the other end. The 232 Series can be used for level and stair applications. Stair applications require beveled washer (sold separately).